Modern Engineering Practice a Reference Library volume 11
Modern Engineering Practice a Reference Library volume 11
Ill American School Chicago
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To save the expense of a large and heavy bronze gear, it is common to make a cast-iron center and bolt a bronze rim to it. The worm, being the most liable to replacement from wear, it is desirable so to arrange its shaft fastening and general acces- sibility that it may be readily removed without disturbing the worm gear. The circular pitch of the gear and the pitch of the worm thread must be the same, and the practical question comes in as to the threads per inch possible to be cut in the lath...e in the pro- duction of the worm thread. The pitch must satisfy this require- ment; hence the pitch will usually be fractional, and the diameter of the worm gear, to give the necessary number of teeth, must be brought to it. While it would perhaps be desirable to keep an even diametral pitch for the worm gear, yet it would be poor de- sign to specify a worm thread which could not be cut in a lathe. The standard involute of 1-44, and the standard proportions of teeth as given on page 120 are usually used for worm threads.
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